[PATCH] add the -mrecip driver flag and process its options

[Sanjay Patel]

Patch updated:
Added comment to explain why a single digit is all we need to specify the number of refinement steps for now.


http://reviews.llvm.org/D8989

Files:
  include/clang/Basic/TargetOptions.h
  include/clang/Driver/Options.td
  lib/CodeGen/BackendUtil.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp

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